The Light's bitterling, Rhodeus lighti, is a temperate

Temperate

In geography, temperate or tepid latitudes of the globe lie between the tropics and the polar circles. The changes in these regions between summer and winter are generally relatively moderate, rather than extreme hot or cold...

 freshwater

Freshwater

Fresh water is naturally occurring water on the Earth's surface in ice sheets, ice caps, glaciers, bogs, ponds, lakes, rivers and streams, and underground as groundwater in aquifers and underground streams. Fresh water is generally characterized by having low concentrations of dissolved salts and...

 fish

Fish

Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...

 belonging to the Acheilognathinae

Acheilognathinae

Acheilognathinae, the bitterling-like cyprinids, are a subfamily of cyprinids.Genera contained herein are:* Acanthorhodeus – spiny bitterlings* Acheilognathus* Rhodeus – bitterlings* Tanakia...

 sub-family of the Cyprinidae family. It originates in Russia

Russia

Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

 and China

China

Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

, from the Amur River basin to southern China. It was originally described as Pseudoperilampus lighti by H.W. Wu in 1931, and has also been described in scientific literature as Rhodeus lighti lighti.

The fish reaches a size of up to 5.2 centimetres (2.0 in), and is native to freshwater habitats with a temperature of 10° to 25° C (50° to 77° F).

When spawning, the females deposit their eggs

Egg (biology)

An egg is an organic vessel in which an embryo first begins to develop. In most birds, reptiles, insects, molluscs, fish, and monotremes, an egg is the zygote, resulting from fertilization of the ovum, which is expelled from the body and permitted to develop outside the body until the developing...

 inside bivalves, where they hatch and the young remain until they can swim.